Grinder for commutators or distributers of motor-car engines.



W. L. ROSS.

GRINDER FOR COMMUTA-TORS 0R DISTRIBUTERS 0F MOTOR CAR ENGINES.

I APPLICATION FILED SEPT-21, I915. 1,1s,s7.

Patented June 27, 1916.

5 A elevation, and Fig. 3 Isa transverse vertical WILLTAM LESLIE ROSS, OF EDINBURGH, SCOTLAND.

To all whom it may concern GRINDER roR-ooMMUTAToRs on DISTRIBUTEYRS or MOTOR-CAR ENGINES.

I Specification of letters Patents I Patented June ZfF, 19116.

Application filed September 21, 1915. Serial No. 51,811.

Be it known that I, W ILLIAM LESLIE Ross,

' of 33 Ivy Terrace, Edinburgh, Scotland,

motor mechanic, have invented certain new and useful Improved Grinders for Commutators or Distributers of Motor-Car Engines,

. of which the following is a specification,

This invention relates to improved grinders for commutators or distributors of'motor car; engines, and has for its object to simplify and 'cheapen the construction of such and to obtain effective working of the apparatus.

According 'tomy invention, the grinder consists of a carborundum, emery, orothe'r suitable wheel or disk having a shaft passing through the center thereofand into and.

through abushforming a part of a box-like bracket. and which shaft is provided with suitable teeth whichgear with the teeth on a gear Wheel carried inside of the boX like bracket. Also carried on the above shaft there isa holder or chuck in which the commutator or distributer is held.- This. holder is provided on its outer periphery with teeth which gear with teeth at the end of the driving shaft which passes through the box-like bracket. Means are also provided on the boX-likebracket for fiiging or clamping the device toasuitablebenchftable, or other fixture, the power being supplied by either hand or foot movement. A- suitable arrange.- ment is provided for adjustingthe commua tator or distri'buter in order to bring it into "contact with the carborundum, emery, or other wheel'or disk; I may also provide a metal strap to retain the commutator or distributer in position when being operate upon) Thismetal strap passes over the outside ofthe commutator and has eaclr end the grinding and-facing is effected by the grinder coming into contact with the worn parts. I may also slightly vary the gear for operating the chuck or holder, so that it may be made to revolve in the opposite:

direction to that of the grinder. A

In order that ,my invention may be properly understood and readily carried into effect, I have hereunto appended one sheet of drawings of which,

Figure l is an elevation of the apparatus embodying my invention. Fig. 2 is'a side section of the same. Fig. 4 is a similar view to Fig. 3 illustrating in part a modified form .of the apparatus, and Fig. 5 is a plan of .part ofthe same, all hereafter more fully referred to and described. I

A is the box-like bracket through the center -of which passes the driving shaft or Q for actuating the mechanism; to the other end of the said shaft or spindle is mounted atooth pinion D which engages with a tooth wheel E beingjn one piece with the external body of the holder or chuck F or formed separate and'lsuitably connected thereto. Mounted coaxially. on the shaft or spindle B is atooth wheel G, contained within the box-like bracket A; The said tooth wheel 'engages with a tooth pinion H mounted on andgiving'motion to a shaft I parallel to.

Q the shaft or'spindle B. Upon the end of the shaft I is mounted the grinding wheel or "disk J composed of'carborundum, emery, or e other such like composition. The commutator or .d1stributer K to be treated or ground 1s carried within the outer'Wall fof the holder or chuck F, and revolves with the i chuck or holder during the grinding operation. The-holder or chuck F and thegrind- I ing'wheel or disk J revolve in the same direction but as seen the wheel or disk revolves at a much greater speed.

. The chuck. or holder F is capable of some lateral play or adjustment in order to present thes'urface of the commutator to the correct position to be acted upon by the grinding wheel J. This is effected by the right and left handed thumb screw L,

screwed into the snug or projection M formed on the outer wall of the box-like bracket A and engaging the pap or projection N formed on the sleeve or bush E? carrying the said chuck or holder F. The sleeve or bush E isconnected to the sleeve or bush E encircling the outer end of the driving shaft or spindle B by a distance piece E The box-like bracket A containing the tooth wheel G and tooth pinion H is composed of two parts having snugs A A ,A formed around the circumference. The two parts are connected together by screws A, A A The apparatus is'cla mped in position to any desired place required for use between the jaws" O, P, Q, by means of the thumb screw-R.

spindle B, To one end of the-shaft or I spindle B is mounted the crank hand lever Referring to Fig. 4 it will be seen that between the tooth wheel E and the tooth pinion D is interposed a tooth wheel S. The

object of this arrangement is to cause the chuck or holder F to revolve in the opposite direction to that of the grinding wheel or disk J.

The device for giving the adjustment differs slightly in the arrangement shown in Fig. 5; the thread of the adjusting screw L works through a bolt T bolted to one of the sections of the box-like bracket, while the other thread of the screw works through the fork U connected to the extension E supporting the holder or chuck F.

Claims.

1. In an apparatus for grinding commutators or distributers of motor car engines, a box-like bracket, a driving shaft or spindle passing through the center of said bracket, a holder or chuck carried by said shaft, a crank operating lever mounted on one end of said shaft or spindle, a toothed pinion mounted at the' other end of said shaft or spindle, a toothed wheel engaging with said pinion for giving motion to said holder or chuck, a toothed wheel coaxially mounted on said driving shaft or spindle, a shaft parallel to said driving shaft, a toothed pinion mounted on said last named shaft engaging with said toothed wheel, both, wheel and pinion being contained in said box-like bracket, a grinding wheel or disk mounted at the end of said parallel shaft and being in contact with the device-under treatment, and means for clamping the ap: paratus in position, substantially as described and for the purpose set forth.

' 2. In an apparatus for grinding commutators or distributors of motor car engines, a box-like bracket, a driving shaft or spindle passing through the center of said bracket, a holder or chuck carried by said shaft, a crank operating lever mounted on one end of said shaft or spindle, a toothed pinion mounted at the other end of said shaft or spindle, a toothed wheel engaging with said pinion for giving motion to said holder or chuck, a toothed wheel coaxially mounted on the driving shaft or spindle, a shaft parallel to the driving shaft, a toothed pinion mounted on said last named shaft engaging with said toothed wheel, both, Wheel and pinion contained in said box-like bracket, a grinding Wheel or disk mounted on the end of said parallel shaft and in con- 3. In an apparatus for grinding commutators or distributers for motor car engines, a box-1ike bracket, a driving shaft or spindle passing through the center of Said bracket, a holder or chuck carried by said shaft, a toothed pinion mounted at the other end of said shaft or spindle, a toothed wheel engaging with said spindle for giving mo tion to said holder or chuck, a toothed wheel mounted coaXially on the driving shaft or spindle, a shaft parallel to the driving shaft, a toothed pinion mounted on said last named shaft engaging with said toothed Wheel, wheel and pinion being contained in said box-like bracket, a grinding wheel or disk mounted at the end of said parallel shaft and in contact with the device under treatment, an intermediate toothed pinion interposed between the toothed wheel of the chuck and the pinion for causing chuck or holder to revolve in the opposite direction to that of the grinder, a thumb clamping screw having a right and left hand screw thread, one'thread of said screw working through a snug in the wall of the box-like bracket and the other thread workingin an extension forming part of the support on which holder or chuck are carried for adjusting the position of the grinding wheel or disk in relation to the commutator or distributer to be ground, substantially as described and for the purpose set forth.

a In testimony whereof I afiiX my signature in presence of two Witnesses.

WILLIAM LESLIE ROSS.

W'itnesses:

JOHN LiooLE, JOHN TRAIN LIDDLE. 

